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The Federal Aviation Administration has ordered a comprehensive review of Boeing’s new 787 Dreamliner jet after a series of incidents this week, including two new problems Friday.

Despite the unusual review, U.S. officials repeatedly stressed that they believe the Dreamliner — the first aircraft made of carbon fibre materials and with complex electrical systems — is safe to fly.

“I believe this plane is safe. And I would have absolutely no reservation of boarding one of these planes and taking a flight. These planes are safe,” said U.S. Transportation Secretary Ray LaHood at a news conference in Washington on Friday.

Still, a series of technical glitches this week, including a a fire at Boston’s Logan Airport and a separate fuel leak are raising concerns about Boeing’s newest aircraft, which began commercial flying in late 2011.

Boeing shares took at beating this week, closing Friday at $75.14 (U.S.), down $1.94. They fell as low as $73.19 during intraday trading on Tuesday.

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Fifty planes are now in service, with about another 800 on order. Boeing, which is rolling out five planes a month, says 150 Dreamliner flights are scheduled every day with 1 million passengers delivered to their destinations so far.

Initial deliveries of the aircraft have been mostly to airlines outside North America, except for six to United Airlines.

Air Canada, which has ordered 37 Dreamliners with seven scheduled to be delivered next year, is counting on the new 787 to refurbish its fleet. Air Canada spokeswoman Isabelle Arthur declined to comment, noting its first delivery is not scheduled until 2014.

Federal Aviation Administrator Michael Huerta told reporters that the review, in conjunction with Boeing, will look at all critical systems including design, manufacturing and assembly.

There will be a special focus on the electrical system, including the use of lithium ion batteries.

“We are confident about the safety of this aircraft. But we are concerned about these incidents and we will conduct the review until we are completely satisfied,” Huerta said.

The same airline later said oil was found leaking from an engine of a 787 Dreamliner after the plane landed at Miyazaki airport in southern Japan.

That comes on top of the fire on a Japan Airlines (JAL) jet in Boston that was blamed on the battery for the auxiliary power unit. Other incidents include a fuel leak on another JAL Dreamliner that forced a takeoff cancellation and a brake problem on an All Nippon Airways jet.

The FAA said it has logged 200,000 hours in reviewing the safety of the new aircraft, which was plagued with serious production delays, coming to market three years behind schedule.

Ray Conner, president and chief executive officer of Boeing Commercial Airplanes, said the company will work closely with FAA officials.

“We’re committing jointly to formalize the process that occurs between FAA and Boeing on an everyday basis. We welcome the opportunity to do it,” he said at the news conference.

As well, Conner noted that it has been more than 15 years since an all-new commercial aircraft has been certified in the United States.

“It’s important to emphasize every new commercial airplane has issues as it enters service,” he said. “And none of these in-service issues that we have seen thus far alter our complete confidence in the 787.”

One of Boeing’s chief innovations with the 787 is its use of electrical power in lieu of hydraulics to control the flight systems of the aircraft.

The weight savings, along with the composite plastic materials, make the 787 more fuel efficient.

To power the electrical system, the 787 uses generators attached to the plane’s engines, which produce about 1.5 megawatts of power, enough to power about 300 hot water heaters. The system uses high-voltage distribution panels and powerful batteries, such as the one that caught fire in Boston on Monday.

Boeing has emphasized all its electrical systems have fail-safe mechanisms, noting it could fly for hours with only one of six electrical generators working.

“Like all innovations in aviation, these are new things,” said Huerte, emphasizing the FAA has had a robust certification process to understand how the systems interact to ensure there are many layers of safety.

“But an important part is also what happens when you introduce it into the system, what is our actual experience,” he said.

“Our focus is on what the data tells us and what we identify as potential issues. Based on what we learn, we will take whatever appropriate action is necessary.”

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